I ran a gear and speed chart for my 48/32 and 11-34 12 speed cassette and 85-100 rpm range. It will easily work in the 15-34 mph range, using only the big ring. Cogs 11-19 all are one tooth shifts, except the 17-19. The 17-19 is the largest percentage change at 10.5%, but it's a better option than having a ridiculously small percentage shift by including an 18. The little ring is too small for this range.
I previously had a 50/34 with a 12-32 11 speed (Campy. I definitely stay in the big ring longer with this setup and don't find myself shifting to the little ring until I get to a hill. I have very few modest hills to climb, so the little ring is used frequently.